CN101860146B - Inner drive for magnetic drive pump - Google Patents

Inner drive for magnetic drive pump Download PDF

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Publication number
CN101860146B
CN101860146B CN2010101754559A CN201010175455A CN101860146B CN 101860146 B CN101860146 B CN 101860146B CN 2010101754559 A CN2010101754559 A CN 2010101754559A CN 201010175455 A CN201010175455 A CN 201010175455A CN 101860146 B CN101860146 B CN 101860146B
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CN
China
Prior art keywords
magnet
yoke
magnetic drive
drive elements
housing
Prior art date
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Active
Application number
CN2010101754559A
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Chinese (zh)
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CN101860146A (en
Inventor
A·M·埃克伯格
P·R·小博尔加德
K·E·克雷姆利奇
S·M·阿伦
D·M·卡尔
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Sundyne LLC
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Sundyne Corp
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Publication date
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Publication of CN101860146A publication Critical patent/CN101860146A/en
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Publication of CN101860146B publication Critical patent/CN101860146B/en
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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22—Rotating parts of the magnetic circuit
    • H02K1/27—Rotor cores with permanent magnets
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
    • H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D13/00—Pumping installations or systems
    • F04D13/02—Units comprising pumps and their driving means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D13/00—Pumping installations or systems
    • F04D13/02—Units comprising pumps and their driving means
    • F04D13/021—Units comprising pumps and their driving means containing a coupling
    • F04D13/024—Units comprising pumps and their driving means containing a coupling a magnetic coupling
    • F04D13/027—Details of the magnetic circuit
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/02—Selection of particular materials
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22—Rotating parts of the magnetic circuit
    • H02K1/27—Rotor cores with permanent magnets
    • H02K1/2706—Inner rotors
    • H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
    • H02K1/274—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
    • H02K1/2753—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets the rotor consisting of magnets or groups of magnets arranged with alternating polarity
    • H02K1/278—Surface mounted magnets; Inset magnets
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22—Rotating parts of the magnetic circuit
    • H02K1/28—Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures
    • H02K1/30—Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures using intermediate parts, e.g. spiders
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K15/00—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
    • H02K15/12—Impregnating, heating or drying of windings, stators, rotors or machines
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K49/00—Dynamo-electric clutches; Dynamo-electric brakes
    • H02K49/10—Dynamo-electric clutches; Dynamo-electric brakes of the permanent-magnet type
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/12—Casings or enclosures characterised by the shape, form or construction thereof specially adapted for operating in liquid or gas
    • H02K5/124—Sealing of shafts
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/14—Structural association with mechanical loads, e.g. with hand-held machine tools or fans

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Dynamo-Electric Clutches, Dynamo-Electric Brakes (AREA)
  • Permanent Field Magnets Of Synchronous Machinery (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)

Abstract

An inner drive for a magnetic drive pump includes a magnet supported on a yoke. The inner drive is driven about an axis to pump a corrosive process fluid. The magnet and yoke are fully encapsulated during the molding process to completely surround the magnet and yoke in a protective plastic shell. A sleeve is arranged radially outwardly of the magnet to provide further protection. Backing rings are arranged on either side of the magnet. A bonding material joins the plastic shell to the backing rings and sleeve to prevent a space from forming beneath the plastic shell that would become filled with the process fluid once it has permeated the plastic shell. A protective coating is arranged on at least a portion of the magnet to further insulate the magnet from the process fluid.

Description

Inner driver for magnetic drive pump
The application is that the application number of submitting on December 7th, 2005 is 200580042111.8, and name is called the dividing an application of application for a patent for invention of " for the inner driver of magnetic drive pump ".
Technical field
The application relates to a kind of magnetic and drives centrifugal pump.
Background technology
Magnetic just drives centrifugal pump to comprise to hold in the moistening part of the process fluid of pumping and has the drying nest that the driver of power is provided to pumping fluid.Drying nest only exposes to the atmosphere around pump.In a kind of typical magnetic drives design, inner driver and outer driver are separated by involucrum, and involucrum prevents that pumping fluid from escaping in environment.Usually be positioned at by the outer driver of electrical motor driven the inner driver on pump impeller that is connected to that drying nest and magnetic drive moistening part.Because magnetic drive pump is packing less, often select them to come the process fluid of the very acid or causticity of pumping, for example hydrochloric acid, nitric acid and clorox.
Outer driver and inner driver all have a series of around its peripheral magnet of installing.Each magnet synchronously is couple to the opposite polarity respective magnet on another driver.Attraction between magnet causes two magnetic couplings between driver, makes the speed rotation that inner driver is identical with the outer driver with being driven by motor.Inner driver must closely navigate to together relatively with outer driver, in order to carry out effective power transmission, this need to keep relatively little gap between involucrum and each driver.In an example, gap is approximately 0.060 inch.
In the magnetic drive pump of a type, mainly by anti-chemistry plastic housing protection inner drive magnets, be not subject to the corrosive process fluid effect, the common injection mo(u)lding of this plastic housing is around the magnet of inner driver.Corrosive process fluid is finally permeated plastic housing, thereby attacks following magnet.Once corrosive process fluid infiltration plastic coatings, shell will expand, and causes interference and failure of pump between inner driver and involucrum.
Thereby needed is more can resist the inner driver of expansion once process fluid infiltration plastic housing.
Summary of the invention
The invention provides a kind of magnetic pumping element comprised the supplementary protection of corrosive process fluid, for example the inner driver of magnetic drive pump.Inner driver comprises yoke, and it has a plurality of magnets that are supported on yoke.The protectiveness coating surrounds at least a portion of magnet, and in an example, it partly extends on yoke.Usually, hardware, for example the alloy sleeve based on nickel, approach configurations of magnets.Plastic housing approaches ferrule configuration.In an example, due to forming process, shell encapsulates yoke and magnet fully, makes and does not need further operation, and for example Plastic Welding, encapsulate yoke and magnet.
Jointing material is configured between plastic housing and metal sleeve, comprises gasket ring, and plastic housing and metal sleeve are engaged with each other.The forming by the chamber of its filling once jointing material has prevented corrosive process fluid infiltration shell.In addition, jointing material prevents that process fluid from reacting with sleeve, and prevents the migration of process fluid between plastic housing and metal sleeve/gasket ring and enter contact and magnet areas.
In addition, the invention provides and a kind ofly once process fluid infiltration plastic housing, more can resist the inner driver of expansion.
By specification and the accompanying drawing above-mentioned and further feature that the present invention may be better understood subsequently, it is below concise and to the point description.
The accompanying drawing explanation
Fig. 1 is the cross sectional view that schematic description magnetic drives the centrifugal pump assembly;
Fig. 2 is the partial cross section view of one impeller and inner driver assembly;
Fig. 3 is shown in Fig. 2 and the cross sectional view of the inner driver that 3-3 obtains along the line;
Fig. 4 is by the zoomed-in view in circle 4 indicated zones in Fig. 3.
Embodiment
Schematically illustrate magnetic and drive centrifugal pump assembly 10 in Fig. 1.Assembly 10 comprises the motor 12 of driving pump 14.Motor 12 and pump 14 are supported by framework 16.Motor 12 comprises the driving shaft 18 on the driven shaft 20 that is couple to pump 14.
Outer driver 22 is supported by driven shaft 20.Outer driver 22 comprises the magnet that is arranged on the outer driver periphery, so that magnetic drive inner driver 28, inner driver 28 supports the magnet that magnetic poles are contrary with magnet on outer driver 22.
Pump 14 comprises the shell 24 that driven shaft 20 and outer driver 22 is supported on to the drying nest 26 of pump 14.Pump box 34 is provided for keeping the moistening part 36 of process fluid, and moistening part 36 is separated with drying nest 26.The accommodating inner driver 28 of pump box 34, inner driver 28 is couple on impeller 30.Impeller 30 is around fixed axis 32 rotations.Process fluid is pumped into outlet 40 by impeller 30 from entrance 38.
In the example shown in Fig. 2, inner driver 28 and impeller 30 form in a certain way in order to one or discerptible impeller and inner driver assembly 42 are provided.Typical inner driver 28 comprises the yoke 44 around a plurality of magnets 46 of its peripheral support.Yoke 44 consists of magnetic conductor usually, and ductile iron for example, in order to absorb the magnetic lines of flux of magnet 46 back.Before or after gasket ring 48 either side that is adjacent to magnet 46 be configured on yoke.Gasket ring 48 for example, consists of nonmagnetic substance (stainless steel) usually, makes them can not interrupt the magnetic lines of flux of magnet active side.
Sleeve 56 configures so that protection magnet 46 is avoided the process fluid effect at the radial outside of magnet 46.Sleeve 56 for example, due to the formation of the alloy based on nickel, hastelloy (hastelloy) or inconel (inconel).Sleeve 56 can be the thin tank be pressed on magnet 46.As alternative, sleeve 56 can be with gasket ring 48 in one be made into integration and from its axially extended machine work encapsulant.
Shell 60 is around yoke 44, magnet 46, gasket ring 48, sleeve 56 moulding, so that guard block is not affected by process fluid.Shell 60 can be by fluoroplastics, and for example ethylene-tetrafluoroethylene copolymer (ETFE) forms.Also can use other to melt machinable fluoropolymer, for example perfluoroalkoxy (PFA).Resin can be also glass or carbon fiber reinforced.For example, can use the fiber of 10-35% scope, and be 20% in an example.
In the prior art, the process fluid that only shell 60 and sleeve 56 protect magnets 46 not permeated shell 60 affects.Yet wishing increases protection to corrosive process fluid.To this, property inner driver 28 of the present invention also comprises the powder coating 52 be configured on magnet 46.Powder coating 52 can extend to the other end of yoke 44 from an axial end of yoke 44, the barrier of relative yoke 44 sealing magnets 46 is provided.Shown in example in, powder coating 52 is configured between gasket ring 48 and yoke 44.With reference to Fig. 3, usually use packing material 54 to make thick filler rod (generousfillet) 50, be provided in the gap 49 between magnet 46.Filler rod 50 provides the smooth transition between magnet 46 and yoke 44, and this has produced the smooth continuous coating that there is no pit and crackle.Be generally used for the packing material 54 of inner driver, fill the remainder in the gap 49 between magnet 46 and sleeve 56, break due to the sleeve that injection mo(u)lding produces preventing.
A kind of suitable powder coating is the epoxy resin polyester mixture, and it has low curing temperature (250-275 ℉).A kind of example mixture has about 50% epoxy resin and 50% polyester.The powder coating preferably has good adhesion, anti-cutting property and chemical resistance.A plurality of coating are desirable.This coating must bear the forming temperature (surpassing 600 ℉) of shell 60.It is below the attribute list of the example of the filling that is applicable to and powder clad material.
Attribute Filler rod and packing material The powder coating
Name of product 1 part of adhesive 2214HD PMF of 3M epoxy resin Sherwin Williams Powdura powder coating-epoxy resin polyester mixture
Matrix The modified epoxy matrix Polyester (80%), epoxy resin (20%)
Main component Epoxy resin, aluminium pigment, synthetic elastomer Polyester and epoxy resin
Adhesion ASTM D-3359-is with 1/16 " square fault-free (crosshatch)
Environment resistant The overlapping shearing of ASTM D-1002-1910psi steel in 100%RH 365 days ASTM-D-B117-is by the minimum salt spray test of 500hr
Getter action Minimum NA
Flexible Referring to hardness and intensity data ASTM-D-522 is by 1/8 " bent spindle
Density 1.5g/ml
Impact resistance The direct & of ASTM-D-2794-100lbs oppositely-superperformance
Viscosity >1,000,000cps-brookfield viscosity (cream).Be heated into rare to be filled The consistency of powder before bake oven is roasting
Hardness 85 Shore D hardness (being similar to) ASTM-D-3363 (thin coating) 2H pencil hardness
Final hot strength 10,000psi
Modulus of elasticity 750,000
Thermal coefficient of expansion (solidifying) 49 * 10-6in/in/C (0-80C)
Curing temperature or coating temperature 2hrs@225F curing temperature 275F coating temperature
Steel T-peels off (ASTM D-1876) 50lbs/ inch width
Once have been found that infiltration shell 60, process fluid just reacts with sleeve 56, form salt and produce other compound that solid material is piled up 60 times at plastic housing.This material stacking often causes causing the differential expansion of the shell 60 of pump 14 faults.In addition, the process fluid of infiltration shell 60 can be subject to the impact of the pumping effect that produced by the deflection of shell 60.This disturbance of the process fluid of infiltration shell 60 has been accelerated the corrosion of sleeve 56 and has forced product introduction contact and magnet areas.
In order to address this problem, property inner driver 28 of the present invention also adopts combination interface between sleeve 56 and any other lateral reactivity material, for example gasket ring 48 and shell 60.This has prevented forming of the chamber that can be filled by solid material or process fluid.
Combination interface 58 is provided by the suitable jointing material on the material that the material of shell 60 can be joined to sleeve 56 and/or gasket ring 48.In an example, jointing material can be the mixed in conjunction with priming paint of polymer-binder and fluoropolymer.In an example, in conjunction with priming paint, under up to 550 ℉, stablize, and there is insignificant zero permeation.The example of two proper formulation is:
Formula 1:
PelSeal PLV2100 fluorubber elastomer, 33% solid-13 gram
PelSeal promoter no.4-0.5 milliliter
DuPont ETFE powder 532-6210-4.5 gram
Formula 2:
Butanone-13 gram
PelSeal PLV2100 fluorubber elastomer, 33% solid-13 gram
PelSeal promoter no.4-0.5 milliliter
DuPont ETFE powder 532-6210-4.5 gram
Formula 2 produces lower viscosity, and sprayed contrary with the application with brush or pad preferably.
Yoke 44, magnet 46, gasket ring 48 and sleeve 56 are assembled into a unit and shell 60 usually around this unit formation.Typical forming process forms space at moulding supporting zone 62.Moulding supporting zone 62 is produced by the strutting piece 64 used in forming process, strutting piece 64 along with shell around this unit formation and by this cell location in desirable position.This space in moulding supporting zone 62 must be filled as Plastic Welding by the secondary fusion operational example.Fusing is created in the interface that has bad combination between basic material and welding material.This often causes forming atenuator region, and this atenuator region provides for corrosive process fluid the early stage leakage paths that enters and corrode magnet 46.
The present invention utilizes the forming process that forms shell 60, has encapsulated this unit fully.The strutting piece 64 that can be a plurality of pins was retracted in the desirable moment of forming process, made the material that forms shell 60 fill mould support zone 62 in forming process.The formula that is used as the plastics of shell 60 can make material flow forward better in mould, once so that the just rapid filling molding supporting zone of strutting piece 64 retraction.
Although disclose the preferred embodiments of the present invention, one skilled in the art would recognize that some modification within the scope of the invention.Particularly, disclosed material and attribute thereof are only exemplary, never tend to limit the scope of the invention.For above-mentioned and other reason, should study claim subsequently in order to determine true scope of the present invention and content.

Claims (10)

1. a method of manufacturing Magnetic drive elements, comprise the following steps:
With the filling plastic mould;
In molding process, in the desirable time, strutting piece is regained from the moulded support zone;
With the described moulded support of filling plastic zone, and encapsulate with plastics the unit that comprises yoke, magnet, gasket ring, sleeve and protectiveness coating fully in described mould, so that housing to be provided, described moulded support zone does not have the plastics of secondary fusion;
Wherein, described gasket ring is arranged on radial outside the axially contiguous described magnet of described yoke, described sleeve is arranged on the radial outside of described gasket ring and protectiveness coating, and described protectiveness coating is arranged between described gasket ring and yoke and between described gasket ring and magnet; And
Described protectiveness coating is epoxy resin polyester powder coating, and described housing comprises at least one in ethylene-tetrafluoroethylene copolymer and perfluoroalkoxy.
2. method according to claim 1 is characterized in that: the formula as the plastics of described housing can make material flow forward better in described mould, once so that described strutting piece is just retracted the described moulded support of filling molding zone rapidly.
3. method according to claim 1, is characterized in that: support step and comprise described cell location in desirable position.
4. a Magnetic drive elements comprises:
Unit, it comprises the magnet be supported on yoke, described unit comprises the moulded support zone;
Housing, encapsulate described yoke and magnet fully with continuous fluoroplastic layer, and in described moulded support zone the plastics without any secondary fusion; With
Jointing material, it combines housing and metal sleeve, and described jointing material has formula as described below 1 or fills a prescription 2;
Formula 1:
PelSeal PLV2100 fluorubber elastomer, 33% solid-13 gram
PelSeal promoter no.4-0.5 milliliter
DuPont ETFE powder 532-6210-4.5 gram;
Formula 2:
Butanone-13 gram
PelSeal PLV2100 fluorubber elastomer, 33% solid-13 gram
PelSeal promoter no.4-0.5 milliliter
DuPont ETFE powder 532-6210-4.5 gram.
5. Magnetic drive elements according to claim 4, it is characterized in that: described housing comprises at least one in ethylene-tetrafluoroethylene copolymer and perfluoroalkoxy material.
6. Magnetic drive elements according to claim 4 is characterized in that: comprise the protectiveness coating, described protectiveness coating is arranged on magnet and yoke top, and the barrier on yoke is provided magnet sealed.
7. Magnetic drive elements according to claim 6, it is characterized in that: the end of described yoke comprises the moulded support surface, and it is configured to receive the moulded support part in the plastics molding process of housing, and described protectiveness coating extends to described moulded support surface.
8. Magnetic drive elements according to claim 6, it is characterized in that: described protectiveness coating is epoxy resin polyester powder coating.
9. Magnetic drive elements according to claim 5, it is characterized in that: described housing comprises at least one in ethylene-tetrafluoroethylene copolymer and perfluoroalkoxy material, has the reinforcing fibre of 10-35%.
10. Magnetic drive elements according to claim 8, it is characterized in that: the metal sleeve that comprises a plurality of magnets and be arranged on described magnet top, and there is spacing between described magnet and metal sleeve, the packing material be arranged in described spacing comprises the epoxy resin with synthetic elastomer and aluminium pigment, and described housing is arranged on described metal sleeve top.
CN2010101754559A 2004-12-10 2005-12-07 Inner drive for magnetic drive pump Active CN101860146B (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US11/009613 2004-12-10
US11/009,613 US20060127253A1 (en) 2004-12-10 2004-12-10 Inner drive for magnetic drive pump
US11/009,613 2004-12-10

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
CNA2005800421118A Division CN101076936A (en) 2004-12-10 2005-12-07 Inner driver for magnetic driving pump

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Publication Number Publication Date
CN101860146A CN101860146A (en) 2010-10-13
CN101860146B true CN101860146B (en) 2013-12-04

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CNA2005800421118A Pending CN101076936A (en) 2004-12-10 2005-12-07 Inner driver for magnetic driving pump

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US (3) US20060127253A1 (en)
EP (2) EP1820254A2 (en)
JP (1) JP4854673B2 (en)
KR (1) KR20070089678A (en)
CN (2) CN101860146B (en)
BR (1) BRPI0518617A2 (en)
WO (1) WO2006062943A2 (en)

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US20100156220A1 (en) 2010-06-24
US20130106018A1 (en) 2013-05-02

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